A Green Synthesis of Polylimonene Using Maghnite-H+, an Exchanged Montmorillonite Clay, as Eco-Catalyst
A Green Synthesis of Polylimonene Using Maghnite-H+, an Exchanged Montmorillonite Clay, as Eco-Catalyst
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DOI：
10.9767/bcrec.14.1.2692.69-78
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发表时间：
2019-04-01
影响因子：
1.5
通讯作者：
Harrane, Amine
中科院分区：
文献类型：
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作者：
Derdar, Hodhaifa;Belbachir, Mohammed;Harrane, Amine
本工作采用一种新的绿色聚合工艺合成聚柠檬烯。该技术包括使用菱镁矿-H+作为生态催化剂来代替有毒的Friedel-Crafts催化剂。Magnite-H+是通过简单的交换过程制备的蒙脱石硅酸盐片状粘土。使用CH 2Cl 2作为溶剂在本体和溶液中进行聚合实验。考察了反应时间、反应温度、催化剂用量等因素对反应的影响，以确定最佳反应条件。溶液中的聚合导致在-5 ℃下反应6小时的最佳产率（48.5%），但是在25 ℃下进行的本体聚合仍然是优选的，即使产率较低（40.3%），以尊重绿色化学的原理，该原理推荐在温和条件下、无溶剂和在室温下合成。所得聚合物（PLM）的结构通过FT-IR和质子核磁共振（H-1-NMR）进行了确认。聚柠檬烯的玻璃化转变温度（Tg）使用差示扫描量热法（DSC）来定义，并且在113 ° C和116 ° C之间。所得聚合物的分子量通过凝胶渗透色谱（GPC）分析测定，为约1360 g/mol。版权所有（c）2019 BCREC集团。版权所有
A new green polymerization technique to synthesis polylimonene (PLM) is carried out in this work. This technique consists of using Maghnite-H+ as eco-catalyst to replace Friedel-Crafts catalysts which are toxics. Maghnite-H+ is a montmorillonite silicate sheet clay which is prepared through a simple exchange process. Polymerization experiments are performed in bulk and in solution using CH2Cl2 as solvent. Effect of reaction time, temperature and amount of catalyst is studied, in order to find the optimal reaction conditions. The polymerization in solution leads to the best yield (48.5%) at-5 degrees C for a reaction time of 6 h but the bulk polymerization, that is performed at 25 degrees C, remains preferred even if the yield is lower (40.3%) in order to respect the principles of a green chemistry which recommend syntheses under mild conditions, without solvents and at room temperature. The structure of the obtained polymer (PLM) is confirmed by FT-IR and Nuclear Magnetic Resonance of proton (H-1-NMR). The glass transition temperature (Tg) of the polylimonene is defined using Differential Scanning Calorimetry (DSC) and is between 113 degrees C and 116 degrees C. The molecular weight of the obtained polymer is determined by Gel Permeation Chromatography (GPC) analysis and is about 1360 g/mol. Copyright (c) 2019 BCREC Group. All rights reserved